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Summary of Significant Accounting Policies - Short-Term and Long-Term Investment Securities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Accounting Policies [Abstract]
Gains (losses) on securities	$ 0	$ 0	$ 0	$ 0
Material gains or losses recorded on held-to-maturity securities	0	$ 0	0	$ 0
Unrealized loss on investments	1,000,000		10,000,000
Available-for-sale investment securities
Available-for-sale investment securities	680,000,000		680,000,000		$ 800,000,000
Held-to-maturity investment securities	176,000,000		176,000,000		37,000,000
Equity investment securities	11,000,000		11,000,000		26,000,000
Total investment securities	867,000,000		867,000,000		863,000,000
Time deposits
Available-for-sale investment securities
Available-for-sale investment securities	630,000,000		630,000,000		790,000,000
Debt securities
Available-for-sale investment securities
Available-for-sale investment securities	11,000,000		11,000,000		8,000,000
Commercial paper
Available-for-sale investment securities
Available-for-sale investment securities	39,000,000		39,000,000		2,000,000
Corporate bonds
Available-for-sale investment securities
Held-to-maturity investment securities	176,000,000		176,000,000		37,000,000
Equity investment securities
Available-for-sale investment securities
Equity investment securities	$ 11,000,000		$ 11,000,000		$ 26,000,000

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